I was using the MyEclipse 6.5, GWT 1.5.2. I installed the gwt designer v5.1.When I have written some source codes, and click design under the window,A designer error occured, and the details is following:

com.google.gwt.core.ext.UnableToCompleteException: (see "project_dir/.gwt-logs/.gwt-log" for details.) at com.google.gwt.dev.cfg.ModuleDef.updateTypeOracle(ModuleDef.java:501) at com.google.gwt.dev.cfg.ModuleDef.getTypeOracle(ModuleDef.java:324) at com.instantiations.designer.gwt.hosted.odf.HostedModeSupport.createModuleSpaceHost(HostedModeSupport.java:230) at com.instantiations.designer.gwt.hosted.ie.BrowserShellIE6$External.gwtOnLoad(BrowserShellIE6.java:255) at com.instantiations.designer.gwt.hosted.ie.BrowserShellIE6$External.invoke(BrowserShellIE6.java:307) at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke(IDispatchImpl.java:295) at com.google.gwt.dev.shell.ie.IDispatchImpl.method6(IDispatchImpl.java:195) at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:119) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2265) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3291) at com.instantiations.designer.gwt.hosted.odf.HostedModeSupport.runMessagesLoop(HostedModeSupport.java:189) at com.instantiations.designer.gwt.hosted.odf.HostedModeSupport$1.run(HostedModeSupport.java:122) at com.instantiations.designer.gwt.hosted.ie.BrowserShellIE6.setUrl(BrowserShellIE6.java:107) at com.instantiations.designer.gwt.hosted.odf.HostedModeSupport.startup(HostedModeSupport.java:120) at com.swtdesigner.gwt.model.widgets.support.GWTState$1.run(GWTState.java:155) at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:369) at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:313) at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:495) at org.eclipse.ui.internal.progress.ProgressMonitorJobsDialog.run(ProgressMonitorJobsDialog.java:268) at org.eclipse.ui.internal.progress.ProgressManager.run(ProgressManager.java:1123) at com.swtdesigner.gwt.model.widgets.support.GWTState.<init>(GWTState.java:176) at com.swtdesigner.gwt.model.widgets.support.GWTState.createState(GWTState.java:1802) at com.swtdesigner.gwt.model.widgets.UIObjectInfo.getState(UIObjectInfo.java:429) at com.swtdesigner.gwt.model.widgets.UIObjectInfo.classByName(UIObjectInfo.java:191) at com.swtdesigner.gwt.model.widgets.UIObjectInfo.<init>(UIObjectInfo.java:68) at com.swtdesigner.gwt.model.widgets.WidgetInfo.<init>(WidgetInfo.java:56) at com.swtdesigner.gwt.model.widgets.panel.AbstractContainerInfo.<init>(AbstractContainerInfo.java:37) at com.swtdesigner.gwt.model.widgets.panel.PanelInfo.<init>(PanelInfo.java:25) at com.swtdesigner.gwt.model.widgets.panel.ComplexPanelInfo.<init>(ComplexPanelInfo.java:26) at com.swtdesigner.gwt.model.widgets.panel.CellPanelInfo.<init>(CellPanelInfo.java:20) at com.swtdesigner.gwt.model.widgets.panel.VerticalPanelInfo.<init>(VerticalPanelInfo.java:28) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at com.swtdesigner.gwt.model.GWTJavaInfoFactory.create(GWTJavaInfoFactory.java:163) at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:113) at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:96) at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:89) at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.endVisit(JavaInfoParser.java:1448) at org.eclipse.jdt.core.dom.ClassInstanceCreation.accept0(ClassInstanceCreation.java:336) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2523) at org.eclipse.jdt.core.dom.Assignment.accept0(Assignment.java:311) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2523) at org.eclipse.jdt.core.dom.ExpressionStatement.accept0(ExpressionStatement.java:143) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2546) at org.eclipse.jdt.core.dom.Block.accept0(Block.java:135) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2523) at org.eclipse.jdt.core.dom.MethodDeclaration.accept0(MethodDeclaration.java:501) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.visit(JavaInfoParser.java:3089) at org.eclipse.jdt.core.dom.TypeDeclaration.accept0(TypeDeclaration.java:466) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2546) at org.eclipse.jdt.core.dom.CompilationUnit.accept0(CompilationUnit.java:213) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at com.swtdesigner.model.parser.JavaInfoParser.parse(JavaInfoParser.java:321) at com.swtdesigner.gef.DesignerEditor.parseCompilationUnit(DesignerEditor.java:1191) at com.swtdesigner.gef.DesignerEditor$18.execute(DesignerEditor.java:1116) at com.swtdesigner.model.swing.properties.custom.DesignTimeHelper.execute(DesignTimeHelper.java:54) at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:1110) at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:1101) at com.swtdesigner.editors.MultiPageEditor.showDesignEditor(MultiPageEditor.java:392) at com.swtdesigner.editors.MultiPageEditor$2.widgetSelected(MultiPageEditor.java:178) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:227) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:962) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:947) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:706) at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3227) at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:2005) at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:316) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219) at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447) at org.eclipse.equinox.launcher.Main.run(Main.java:1173) at org.eclipse.equinox.launcher.Main.main(Main.java:1148)

Full stack trace (to see full context):org.apache.commons.lang.exception.NestableError: com.swtdesigner.properties.PropertyException: java.lang.reflect.InvocationTargetException at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:119) at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:96) at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:89) at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.endVisit(JavaInfoParser.java:1448) at org.eclipse.jdt.core.dom.ClassInstanceCreation.accept0(ClassInstanceCreation.java:336) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2523) at org.eclipse.jdt.core.dom.Assignment.accept0(Assignment.java:311) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2523) at org.eclipse.jdt.core.dom.ExpressionStatement.accept0(ExpressionStatement.java:143) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2546) at org.eclipse.jdt.core.dom.Block.accept0(Block.java:135) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2523) at org.eclipse.jdt.core.dom.MethodDeclaration.accept0(MethodDeclaration.java:501) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at com.swtdesigner.model.parser.JavaInfoParser$ParserVisitor.visit(JavaInfoParser.java:3089) at org.eclipse.jdt.core.dom.TypeDeclaration.accept0(TypeDeclaration.java:466) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2546) at org.eclipse.jdt.core.dom.CompilationUnit.accept0(CompilationUnit.java:213) at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2476) at com.swtdesigner.model.parser.JavaInfoParser.parse(JavaInfoParser.java:321) at com.swtdesigner.gef.DesignerEditor.parseCompilationUnit(DesignerEditor.java:1191) at com.swtdesigner.gef.DesignerEditor$18.execute(DesignerEditor.java:1116) at com.swtdesigner.model.swing.properties.custom.DesignTimeHelper.execute(DesignTimeHelper.java:54) at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:1110) at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:1101) at com.swtdesigner.editors.MultiPageEditor.showDesignEditor(MultiPageEditor.java:392) at com.swtdesigner.editors.MultiPageEditor$2.widgetSelected(MultiPageEditor.java:178) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:227) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:962) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:947) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:706) at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3227) at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:2005) at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:316) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219) at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447) at org.eclipse.equinox.launcher.Main.run(Main.java:1173) at org.eclipse.equinox.launcher.Main.main(Main.java:1148)Caused by: com.swtdesigner.properties.PropertyException: java.lang.reflect.InvocationTargetException at com.swtdesigner.gwt.model.GWTJavaInfoFactory.create(GWTJavaInfoFactory.java:171) at com.swtdesigner.model.parser.factory.JavaInfoFactory.create(JavaInfoFactory.java:113) ... 65 moreCaused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at com.swtdesigner.gwt.model.GWTJavaInfoFactory.create(GWTJavaInfoFactory.java:163) ... 66 moreCaused by: org.apache.commons.lang.exception.NestableError: org.apache.commons.lang.exception.NestableError: java.lang.reflect.InvocationTargetException at com.swtdesigner.gwt.model.widgets.UIObjectInfo.classByName(UIObjectInfo.java:193) at com.swtdesigner.gwt.model.widgets.UIObjectInfo.<init>(UIObjectInfo.java:68) at com.swtdesigner.gwt.model.widgets.WidgetInfo.<init>(WidgetInfo.java:56) at com.swtdesigner.gwt.model.widgets.panel.AbstractContainerInfo.<init>(AbstractContainerInfo.java:37) at com.swtdesigner.gwt.model.widgets.panel.PanelInfo.<init>(PanelInfo.java:25) at com.swtdesigner.gwt.model.widgets.panel.ComplexPanelInfo.<init>(ComplexPanelInfo.java:26) at com.swtdesigner.gwt.model.widgets.panel.CellPanelInfo.<init>(CellPanelInfo.java:20) at com.swtdesigner.gwt.model.widgets.panel.VerticalPanelInfo.<init>(VerticalPanelInfo.java:28) ... 71 moreCaused by: org.apache.commons.lang.exception.NestableError: java.lang.reflect.InvocationTargetException at com.swtdesigner.gwt.model.widgets.UIObjectInfo.getState(UIObjectInfo.java:436) at com.swtdesigner.gwt.model.widgets.UIObjectInfo.classByName(UIObjectInfo.java:191) ... 78 moreCaused by: java.lang.reflect.InvocationTargetException at com.swtdesigner.gwt.model.widgets.support.GWTState$1.run(GWTState.java:165) at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:369) at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:313) at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:495) at org.eclipse.ui.internal.progress.ProgressMonitorJobsDialog.run(ProgressMonitorJobsDialog.java:268) at org.eclipse.ui.internal.progress.ProgressManager.run(ProgressManager.java:1123) at com.swtdesigner.gwt.model.widgets.support.GWTState.<init>(GWTState.java:176) at com.swtdesigner.gwt.model.widgets.support.GWTState.createState(GWTState.java:1802) at com.swtdesigner.gwt.model.widgets.UIObjectInfo.getState(UIObjectInfo.java:429) ... 79 moreCaused by: java.lang.RuntimeException: Exception during initializing GWT, see .gwt-log for details. at com.instantiations.designer.gwt.hosted.ie.BrowserShellIE6.setUrl(BrowserShellIE6.java:110) at com.instantiations.designer.gwt.hosted.odf.HostedModeSupport.startup(HostedModeSupport.java:120) at com.swtdesigner.gwt.model.widgets.support.GWTState$1.run(GWTState.java:155) ... 87 moreCaused by: java.lang.RuntimeException: Failure to load module 'com.google.gwt.news.HomeIndex' at com.instantiations.designer.gwt.hosted.ie.BrowserShellIE6$External.gwtOnLoad(BrowserShellIE6.java:267) at com.instantiations.designer.gwt.hosted.ie.BrowserShellIE6$External.invoke(BrowserShellIE6.java:307) at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke(IDispatchImpl.java:295) at com.google.gwt.dev.shell.ie.IDispatchImpl.method6(IDispatchImpl.java:195) at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:119) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2265) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3291) at com.instantiations.designer.gwt.hosted.odf.HostedModeSupport.runMessagesLoop(HostedModeSupport.java:189) at com.instantiations.designer.gwt.hosted.odf.HostedModeSupport$1.run(HostedModeSupport.java:122) at com.instantiations.designer.gwt.hosted.ie.BrowserShellIE6.setUrl(BrowserShellIE6.java:107) ... 89 moreCaused by: com.google.gwt.core.ext.UnableToCompleteException: (see "project_dir/.gwt-logs/.gwt-log" for details.) at com.google.gwt.dev.cfg.ModuleDef.updateTypeOracle(ModuleDef.java:501) at com.google.gwt.dev.cfg.ModuleDef.getTypeOracle(ModuleDef.java:324) at com.instantiations.designer.gwt.hosted.odf.HostedModeSupport.createModuleSpaceHost(HostedModeSupport.java:230) at com.instantiations.designer.gwt.hosted.ie.BrowserShellIE6$External.gwtOnLoad(BrowserShellIE6.java:255) ... 99 more